DevTools: Async call stacks for Promises and Object.observe.

Source/core/inspector/InspectorDebuggerAgent.cpp

Index: Source/core/inspector/InspectorDebuggerAgent.cpp
diff --git a/Source/core/inspector/InspectorDebuggerAgent.cpp b/Source/core/inspector/InspectorDebuggerAgent.cpp
index 39b9b1ea3a67c6397c190d37463d094d77f7df33..caa4155d3dd0757297bb5ad1e0a21a0f33c3af05 100644
--- a/Source/core/inspector/InspectorDebuggerAgent.cpp
+++ b/Source/core/inspector/InspectorDebuggerAgent.cpp
@@ -59,6 +59,14 @@ using WebCore::TypeBuilder::Debugger::ScriptId;
 using WebCore::TypeBuilder::Debugger::StackTrace;
 using WebCore::TypeBuilder::Runtime::RemoteObject;
 
+namespace {
+
+static const char v8AsyncTaskEventEnqueue[] = "enqueue";
+static const char v8AsyncTaskEventWillHandle[] = "willHandle";
+static const char v8AsyncTaskEventDidHandle[] = "didHandle";
+
+}
+
 namespace WebCore {
 
 namespace DebuggerAgentState {
@@ -809,6 +817,20 @@ void InspectorDebuggerAgent::didDeliverMutationRecords()
         m_asyncCallStackTracker.didFireAsyncCall();
 }
 
+void InspectorDebuggerAgent::didReceiveV8AsyncTaskEvent(ExecutionContext* context, const String& eventType, const String& eventName, int id)
+{
+    if (!m_asyncCallStackTracker.isEnabled())
+        return;
+    if (eventType == v8AsyncTaskEventEnqueue)
+        m_asyncCallStackTracker.didEnqueueV8AsyncTask(context, eventName, id, scriptDebugServer().currentCallFramesForAsyncStack());
+    else if (eventType == v8AsyncTaskEventWillHandle)
+        m_asyncCallStackTracker.willHandleV8AsyncTask(context, eventName, id);
+    else if (eventType == v8AsyncTaskEventDidHandle)
+        m_asyncCallStackTracker.didFireAsyncCall();
+    else
+        ASSERT_NOT_REACHED();
+}
+
 void InspectorDebuggerAgent::pause(ErrorString*)
 {
     if (m_javaScriptPauseScheduled || isPaused())